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Using the first-principles spin density functional approach, we have studiedmagnetism of a new type of all-carbon nanomaterials, i.e., the carbon nanowiresinserted into the single-walled carbon nanotubes. It is found that if the 1Dcarbon nanowire density is not too higher, the ferromagnetic ground state willbe more stable than the antiferromagnetic one, which is caused by weak couplingbetween the 1D carbon nanowire and the single-walled carbon nanotube. Also,both dimerization of the carbon nanowire and carbon vacancy on the tube-wallare found to enhance the magnetic moment of the composite.

Ferromagnetism of an all-carbon composite composed of a carbon nanowire nside a single-walled carbon nanotube